Agrippina the Elder accuses Gnaeus Calpurnius Piso of having assassinated her husband Germanicus Julius Caesar in Antioch. However, there is no credible evidence and the charge is never proven. (In ancient times, when medical science was not advanced, poison was usually suspected whenever a young, healthy person died suddenly. There was no way to pinpoint and trace the substance after death; therefore, it was considered a quick, easy and non-traceable form of homicide.)